Search for E.T.
But not everyone buys one popular physicist's downbeat argument.
No one has found E.T. yet, but we may be getting closer.
Columbia University astronomers say their laser plan would work, but others aren't so sure.
It will be able to detect and receive signals from outer space and help search for extraterrestrial intelligence.
Scientists argue "early Armageddon" snuffs out alien life before it has a chance to evolve.
Acclaimed scientist says it may be disastrous to reach out and touch aliens.
A new venture to scan the skies for alien life just got Stephen Hawking's backing. At the Royal Society in London today, the